Questions tagged [knife-tool]

The Knife Tool cuts new edges into meshes, adding vertices to user-defined points regardless of existing topology. The Knife Project Tool projects the topology of one object onto another, using the current view angle. Use this tag for questions pertaining to the Knife Tool and the Knife Project Tool.

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462 views

Blender exported mesh extremely deformed

After exporting my mesh to FBX form to test out my sails in physx clothing, I noticed my mesh was terribly deformed. There were a lot of random spikes and abnormalities that appeared in the main hull ...
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Blender knife tool not working as expected

I'm trying to create vertexes using the knife tool; the object in perspective mode is: in plane after using knife: A point is always created on the back edges: It's incredibly frustrating to have ...
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Projection Cut around a complex Shape

i´m currently modeling a PS4 Controller. I nearly finished my work on the model, but theres just one last step, which im stuck with: I want to create a cut around the controller, that later will ...
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Cut Custom Shape into Side of Cylinder

I am trying to model a British Sterling L2A3 & I'm having serious issues with modeling the ejection port. The main body of the weapon is a cylinder with many different types of cuts, and I ...
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Blender 2.8 snap, knife tool does not work properly

Here is my question: https://stackoverflow.com/questions/60684130/blender-2-8-snap-knife-tool-does-not-work-properly Vertex extrusion to edge with snap enabled has gap (snap vertex to vertex is ok) ...
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Smoothing Uneven Concave Surface

After applying the boolean modifier for the cut, I need to clean up the scruffy looking concave section of this object. There was a method on youtube using the knife tool plus some additional ...
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1answer
54 views

Airplane windshield

I’m trying to create a high detail 787 and I am currently on the windshield part. My question is how do you properly model a knife project object to work on all axis? Here’s my current window cutout: ...
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How to connect faces between 2 edge loops?

I'm trying to fill empty space in my mesh, and I looked at the knife tool page on the Blender Wiki, and I'm not sure if there's a way to make it so that a new edge is made using the knife tool. I took ...
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28 views

Is this valid geometry? Any problems for games?

I'm looking to make low poly models for games so I'd like to keep poly counts minimal, but there is one thing I've done with the knife tool and I'm not sure if it causes any issues. I honestly don't ...
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1answer
97 views

Problem with Intersect (knife) - making extra cuts in mesh

I am trying to make a thread around a cylinder by cutting faces at the intersection. The cut tool makes extra vertices and connects vertices in random places. I also tried using the boolean intersect ...
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1answer
281 views

knife tool 2.8- used in past with no problems

Vertices are not appearing when I drag with the knife tool across the object in edit mode. Am I missing a toggle somewhere? I would include a picture/screenshot but wouldn't really show you anything ...
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How to cut extra piece of face on intersection with other face? [duplicate]

There is no common edges or vertices on intersection
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1answer
462 views

Messed up Topology (Shading?) due to the usage of the Knife Project Tool

Dear Blender Stack Exchange Community, After trying to model a sword (after a concept art) I did run into some issues after using the Knife Project Tool. I am trying to add some Screws using the ...
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27 views

Knife Tool creates redundant edges and faces

When I use the Knife tool, Blender 2.81 create edges and faces which I don't want. How can I only create the edges and vertices which I draw with the knife tool?
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1answer
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The knife tool won't show the exact result that was done before pressing enter

So the first picture is right after I selected where I will cut, and the second picture is after pressing Enter/Space Bar which should apply my previous result to the world. But it is not what I asked ...
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1answer
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How do I attach floating vertices to the mesh?

I am trying to make a turbine with cuts in the sides. I did this with the knife tool and copied the vertices made with the knife tool to the areas marked on the picture. At the place where I used the ...
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1answer
68 views

Adding a vertex onto an angled edge in precise X position

I'm designing a part for 3D printing, but I do not know how to cut an angled edge at a precise absolute X position. I marked in red the place where I would like to insert a vertex. It's exactly 2 ...
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1answer
80 views

How to use one object to cut a hole into another one [duplicate]

My issue is that I have 2 objects in edit mode, I want to use the second object to cut the first one to make a hole. I hope the image can make what I want a little clear because I don't find the ...
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126 views

3D Connexion Space Mouse stops responding during Blender operations

As the question title suggests, I have a minor problem with Blender's implementation of Space mouse/3D mouse control. I finally got the actual operation of the 3D mouse to be like I want. Except ...
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1answer
133 views

Non-manifold, bad contig Edges and Sharp Edges on simple basic geometry

I have had issues trying to produce clean geometry for 3D printing for what is simple geometry. I check wether my mesh is clean or not using the 3D printing addon. Here is a step by step simple ...
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6answers
158k views

Cutting a mesh in half

I have a mesh which I have imported from an OBJ file. I would like to apply Material A to the section of the mesh which is on one side of a given plane, and apply Material B to the section of the mesh ...
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Is there a way to bisect using a compound line or curve?

Right now, the bisect tool only works with a single straight line. I'm just wondering if the the question above is possible and, if so, how?
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Why I can't cut there with the knife tool, I want to make a quad out of this n-gons

Why I can't cut there with the knife tool, I want to make a quad out of this n-gons
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Why can't I use my knife tool project wide?

Been using Blender for years, but for some reason in this project I'm working on I can't use the knife tool. Its all low poly stuff and I've used the knife tool in the project since I started it. At ...
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1answer
322 views

Knife Project not available 2.8 (trying to cut two shapes out of one)

For some reason my knife project is not available when I search it, the only thing that comes up is knife, I am trying to cut one shape out of another shape but keep both shapes in tact so I would ...
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1answer
298 views

Knife tool with bmesh API

I need to find the intersection curve between two (open) meshes, and I can do that interactively with the knife tool. In search for a way to do it from a script, I came across the following highly ...
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Is it possible to Cut a curve in a sphear?

I want to cut a semi-circle curve into a sphear then apply solidify modifier. However i always end up with crimping along the curves. Is it possible to cut smooth curves in blender??
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How to cut edges with knife without deforming new vertex and edges?

I'm trying to cut a ring with knife tool in a rigged mesh, but new vertex and edges move to another position, I used to do this procedure but I didn't have problems, I don't know if I pressed a key, ...
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Attach road to terrain in a single mesh

I have the following terrain and road (extracted from OSM) i want to combine them so i can have 'nice' quads for the road and borders mixing nicely with the terrain; and combine everything in a '...
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48 views

knife tool not ending

I'm just starting to use the knife tool and, after I finish using the knike tool, I can't seem to get it off of the knife tool. How do I get it off of the knife tool?
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Can i select “extra edges” in ngon by script or special command in blender?

I have a problem. Maybe somebody can help me. I want select man on plane after knife projection without these "extra edges by script or one command". 1) Can i select "extra edges" in ngon by script ...
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2answers
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Pushing back part of extruded region after using knife tool

Is there an easy way of pushing back the faces on the left part on the screenshot (selected faces) to the place the original faces were extruded from? Result should be like the one the right side. The ...
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1answer
64 views

Quad Junctions. Why are some not working the same as identical looking one nearby?

NOTE: as per Moonboots helpful suggestions. Here is the .Blend file for this problem: Hello all I am trying to learn Blender. I've read lots and watched lots of videos and kinda understand the ...
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3answers
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Making a hollow cylinder - Blender 2.80

I am trying to recreate the C64 logo in 3D, which roughly looks like this: C= My thought was to create a cylinder the size of the C, then create a second cylinder the size of the inside of the C, lay ...
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77 views

How to fix weird edges when doing knife project?

I am quite new to hard surface modeling but wanted to get into it a little bit. I am doing something like a Porsche 911 back and wanted to cut out the bonnet area. Since I thought Knife project would ...
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Cut out everything within a volume. Is it possible?

I have a very large model of terrain, spanning several thousand kilometers, with meshes of buildings and trees scattered across it. I'm only interested in one single area of the terrain, and I want to ...
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1answer
307 views

Blender 2.8 (Python) - knife project

In Blender/Python 2.8, I am trying to use knife project to cut a circle through a cube. I am attempting to automate a process I can do manually. My code is below; the last line throws this error: ...
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654 views

knife_project in python

I am a blender noob trying to use bpy.ops.mesh.knife_project() in my script. It fails with the message: RuntimeError: Operator bpy.ops.mesh.knife_project.poll() expected a view3d region & ...
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314 views

Blender 2.8 carving a circle out of the face of a cube using the knife tool [duplicate]

In Blender 2.8, I am trying to cut a circle out of one face of a cube, but for some reason I can't get it to work. My procedure thus far: (a) Add the cube (add -> mesh -> cube) (b) Add the circle (...
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Beginner Problem with Knife Tool

How can I use the Knife tool to create a line between two vertices? When I try to use it, the tool simply deselects my first vertex.
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126 views

Break up Model and Texture For Unreal Engine 4 Import

I have a large model (.obj file) that was generated by another piece of software and represents a real world location. I also have a very large texture (.jpg file) that was created from images of that ...
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68 views

3D Jigsaw Sphere

I've made a sphere which is UV wrapped with a picture of a world map, and then made hollow by using the 'solidify' modifier. I was wondering if I can break up this hollow sphere into a 3D jigsaw ...
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61 views

How do you cut a clean hole into an object that has been subdivided?

I can't get it to work using any of the existing answers to this question. I have a box that has been subdivided. I want to cut a square hole into it. I've tried using Knife Project and the Boolean ...
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27 views

Knife cut with closed sides like boolean difference does

I am using knife project to cut holes into an object. Is there a way to close the sides of the cut so I cannot see the hollow inside of the remaining part? I created the second picture using boolean ...
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46 views

Making a printable half sphere with a cutout in it for 3D printing

I made a half sphere which prints nicely. The sphere is to be used as a stencil for marking your golf ball. I used the Knife Project to cutout the F. This however created a lot of non-manifolded ...
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294 views

How can I make the knife tool cut in a straight line between two vertices?

If I were to make a sphere and cut between a vertex near the sphere's "north" and a vertex near the sphere's "east," the cut becomes curved in a way reminiscent of the Coriolis effect. I just want the ...
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68 views

Split unjoined mesh into smaller grid based chunks

I have a large blender scene consisting of different objects like streets, trees, walls, roofs, etc. all created from an openstreetmap file imported into blender. I want to split the complete scene ...
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1answer
292 views

How to make a precise bolt hole in a simpler way?

I'm new to blender and using it to create 3d objects for my printer. Part of this is "cutting" holes for bolts very precisely which I managed to do but my way is so long/tedious I must be missing ...
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4k views

Knife project not cutting through

I have a simple rounded edge prism. I created a circle to use as the "knife" because I want to cut 2 holes through the prism. I first select the circle, then select the prism, go into ortho view, ...
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2k views

Slice up terrain mesh into chunks

I have terrain (ANT Landscape plugin) that I would like to cut up into chunks (don't need to be equal size) for a game engine so that I can do occlusion culling / or load and unload chunks around the ...